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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d4c06ac6162bbf361f8ac5bbf5d5ec3ae0255e2bfd4b8e02aab5011bd6caa6' 
  AND token = 'vXqPJxLxtGFRGs+Uujrflsb8UNTZYSuEUQLOvuby3NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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