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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b1b4f71687356097b5fcbd86a40622e2c482459805bab65aaf2bf784f2945c' 
  AND token = '2/0eRR0ixKntWCNYA/ijGqDLzbPlSVo3V2MYUhAPS40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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