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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a9e4e1bed12b640fada4b745a7d28a35936e60f401fa5d44b0e1e94d60a445' 
  AND token = 'OAkNqZua20JRC1pp7UREaZNPbiCL/OoySNiZWhUiS50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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