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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328b65b83b5defc33c4931e47683e31661ee92f789aa7025fb90bdc2cc713f59' 
  AND token = 'ro+6NfT/vpSYid7KxZBCeI3e4E9JQJ/2luIolmGEL8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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