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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0276765b910d33a97b97d52716bf6c71bc9aac181b7458114652946cbbbf000' 
  AND token = 'NdX9eHNM7Fsn8AGYEV8OiqqTcsq9T3cuxgGCFX7e95I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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