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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d83b821bd1875dd5f90d5466d4c86a9f88d74e8f2fcbcd08d11d583d61526d' 
  AND token = 'D2nwEAhFVQ4d1ggNOHF/4FeDczMloc5PDjd7eYa2/vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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