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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b79177167787d22b77a3dc1b1055f290dacff9d8e613b7bbf39f29ed3456ac' 
  AND token = 'S9sT+jk+PCRRq3rwOyDw4dD3Z2OHeyYQCCjn4wTc4TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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