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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972111bf38d568f629088a43559832db7f7e8b955007bdefd68f448fdbcee916' 
  AND token = '6LMwFBRIB7D64hhNmD6FEyuDOmRCQ6yP4cBLreGbwrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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