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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86314a5026892b5854c956c7bd934fc00e7d44578e0e907eff7955e5e2e9a22d' 
  AND token = 'wwzwdI9pX+H3b93FwtnHCPvX9oUYfRdD7dUaHj6rC3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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