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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7044954c13c94ea692d226ccab7b55f74325c85473fe79d1be2ce822fdafab' 
  AND token = 'g1gPj42cF1erW6+j7RANrpRfZVWkba0SmO6wdXoczgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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