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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c0da84a7c8480b24da023f49938790bfc7d42c604728ef667aad00add8fcc8' 
  AND token = 'VD3YEc52bi4kL8mkvAYAcC/fNeeXYYh5qZB1/4hxasM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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