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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8db507e05d7a2e3170c306cc5337dee5b369497f8f1c7db82b70a093b55deb6' 
  AND token = 't1AEPxCe4ABKb+gnOhXfCso8aB2NwiTo5eaiMB0+A2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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