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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af93cb67e86e1fd250ddfee3bd30341c7c9952cc910d5834df86d7169fb619a8' 
  AND token = 'THzNRXcQX1n8l7fv3Io42hjtOxtixKctE1aEWbEGXdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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