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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d56f8db4750e6c665ccb2561c7bf5b6b1f2881b107092c6fdc3c8002e3f77a' 
  AND token = 'K1oEfdSES9TD17LkKnGfPJ8gJwabib8Ish+rZICXmFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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