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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdaaba1cff241c124cb3a00ef77c6e6fa7a88cf1fbb53de0f9e33605cd5568d' 
  AND token = '6gxzaB6FkzE3nEADUalzogG4oNmeagKKUstFjp/sQws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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