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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080cbf6a402fae38a44bb66398f87fc3ca504e479481206be5af04ef067e23ac' 
  AND token = 'Wa5ju64RZ0AzeIVOXESbkm9RhUCElfE5jPQbMUDiT6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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