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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f329d3c82e08528a3bd67f01e76a7dafc5bba9f9c0483070bde12d9453affbf9' 
  AND token = 'xHi4wdMnAXAnFg1AhfOsVfVkw+QWEPR2EgkjQjd3o/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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