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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbaea9f32483de961e152eb8272d0bc78f3ea712df3e14d68539a89637c46275' 
  AND token = 'xFyMzjfG0WAr9UYe3d7DuP7NONaZ4nbTKuBeyYKsE1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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