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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f65b31816dd012a9a272813ff26baa04a054252d1b68589a464cde2c75a4f9' 
  AND token = 'znDyju/nL8JrU9aseGKCrmqkf5e9scwzX+E5cBO5Ve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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