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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2ca26a8084eb2f7d420153494378b07eac2d4f4994ab4118feb405acdf629d' 
  AND token = 'gNokDHuAm1L/IcxWwlObDdSstDaU13yWWidknRt9Xyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}