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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '258c43acf8a0b3fee7115e7ebb24756ff93451d7a384baf17d6f876c30066766' 
  AND token = 'd31UoHUJ+CMk95TJsQm7xMPx7/LFeepmg44kRKpFHyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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