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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fab26201a360cc06c174f20d624ba33134a3b77bcddf81b3717c3943ce3dbb' 
  AND token = 'nHWaczeMDuV2h0IoFqQBkkITk2swvZFpvDytOyIAuqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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