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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799a531854693abfda41a4c52eccece0f3453b10b8c3ee1a937b364214c75e9f' 
  AND token = 'Oc/QtPq63Jj+/iHjgtScC5p1viaycLBlO38C3OlBodE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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