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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e768edaa85357d05c713d0229e713b5be03837f78b5dcab63ccfad459f44eee' 
  AND token = '8XBNceKJuh0w277mZ4AtdG2y5ah9HAa9x0M42CCTXEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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