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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235223d0bfade14ae11a3cafa2adf07cd106b3fd30d6ce308acaea767dd3ff0e' 
  AND token = 'efrN7o6epN/NDvbeqZ2OnzIwnYq4ZocED0xXCbnSDXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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