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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a847150bbfafd569c809edef7e408cf3a5a45efa5353b27ac0778cb29133eff' 
  AND token = 'rN7OMQORDxzHmgp5u1+NiYMlWKdkbeS5NIhfdSh3hOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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