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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7659093472bdb8dd577bf79bd073e137b2ea187a9e5a3f74405565547e7ce772' 
  AND token = 'VhMR+7XmK31tPccH5GsgJ3C9JaDW1ObtRE833erPnU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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