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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecd5cda65e96634e030742c96fca3c78c495a20eb43ae0befd4e2c0cf8c4046' 
  AND token = 'N6o2KYchYa1VOxyH1p4OJnK6laNJGRB0XHaj+CCATq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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