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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e152a3ebf32bcfd850c4dcead07e6924fe0af2b1d6c5ca2b3388a5088f06a10d' 
  AND token = 'UlG7Ys29ajHOds2eBq1Rcz37/lPtAk4Xi5ENfDuwyZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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