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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365739087ce1762e6138e29457ab55b2feb097ca58d96a6be9d85bdb0ec62e61' 
  AND token = '4rHwAKHzI+dvdcHeVAHljH3Rtp/8unv9sr+itdtBqK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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