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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9abca3b89b3f59d469b6c77368c45b4c19b11826ea980d43e3216cd8f37b13' 
  AND token = 'wA8V68XJ19HnKhBZk7aI9q23B+umGhtFrG/qcqdLiqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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