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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58e8c7e0063b6946aa8cb98a20391f1d37773c494a59940bae0f985bab99d8c' 
  AND token = 'DYi3J9LwO7HGJhodqqS2ck7+CCPbP1snfFmj+tT99Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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