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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5c1d608bf1575cab3843dccb5ac5a84cf3edac9577595d7a2e3f9c054fd9df' 
  AND token = 'Bre7PGkkzlepBYjuW/AYr/icPpu4pYA4ekWh0kKgkCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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