SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd79594e31c97322554660ab9330892d359b69ffd456bc8d2458f34a34b482d' 
  AND token = 'UegKWjw3Xd/d94JT26uPmtUK+WD1i9YcWKOfKZvrqnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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