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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8151a3c87617fbf501b12af5fce0ede26806a10a4f0473fca3adb35eeccfc1' 
  AND token = 'VuZNQPnC4PbZ2SnIQKGBekWRjD1Vw1X6Ldq6EO9pM3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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