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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccc1e07dab9f19a89b694adde2d384a75046bd502676ec4a74509cd11740574' 
  AND token = 'Ugw1kw5Q543jq7CaIOhqNP9zmAIjvs9hGAWxys9CWvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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