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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4c64fc04d6e24eb28a8bfd78113397e69f07c26dc1434b2c7daae6dfbefd09' 
  AND token = 'k0cGvNZYzSKjhU2FjvU1o/1Z/0K8l4YFuAxyMTUeCHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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