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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9646082cf8aaa242c5fab523c506cc5b164f40a0597dbc180ba02831663a725' 
  AND token = '1xkV/8bUeiJIjHU70Mbovb931nKoasQ+D+L3ejgP2c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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