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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d9caf84cd341914f8cf185ad795d09449ce32fc62fa552edb1d05e9a3bdcca' 
  AND token = 'ojHCW3iBF9hLJNWwcYIRm965Q8a7dgP0+ix/40+Wegc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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