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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a09850d620f10dfa4642ec4d736d7078c9582f8c727efe7ea60bb4811a3496' 
  AND token = 'aeu7m199GTxScMwPospYeW/zbCOyr3Mg8SObkdFtzIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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