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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f20ea1a28f9eab75c7ab9f7c189a53c2f46ecae809d00873741eff61dbf086d' 
  AND token = 'IVgPj6Qm1SMtx8OOtUiS+IXrfpKUu+rhgwmATNAsaXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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