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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae0aa5a7a907af2961ff4994a9ec717d8db02cdb0dcec541af6142462a155af' 
  AND token = 'tms+RUgZ6obTyOsg+hIf7LFu5r8jg/zb865/Iy5ltJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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