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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2e14368ee6fad7c03774ceecaf0b8edf5d436e32a0eda6cf6131a18db58821' 
  AND token = 'FLiie4cMTET4TFtF4UOKoGDOT3xPcespITilNaRfIdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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