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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31ab06382c3be735837b034da7dcb1222dec87242e0b44b3370210017e398dd' 
  AND token = '9rmtPeUjQdiaOPpEXaL8VlL/BZWkng+eM+fzdiUc7Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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