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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d96ea7d8c8b155d9edec702c9f36ae4ef0163b8ab0bd743dda429a54e46b4c2' 
  AND token = 'KZsV93sh6zYiI3ULokAe7fZqKYvPv7iO4UHf/qi3HF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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