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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13733d9a2a3734bee966922edd5c14b66a61ae66000c2820d33454f063ec1ee1' 
  AND token = '+STIwLSs36DcfkUA5PblBcgcDsvik8OLe4Z+ZOD0VtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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