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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba5dc035cd887394134fde08ae46cbef883099101adeacb80d28c240e660451' 
  AND token = '7I+5Dt9aJk6uxCxJx/qzCKc28Ihwy/N829RC4eTOAAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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