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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891e8327264d27694c8d6a6d191cd228ed976e84a451857b0e284cbc252d197a' 
  AND token = '8rw2MJNOxc1B4aClATB8DOPpfPgA62Js0ENTSXYwoUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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